Just like in A PRIVATE LITTLE WAR. I still think it's moronic to tell somebody to slap him back to consciousness. You don't talk if you're unconscious. He just wanted to be slapped by Chapel and especially M'Benga. Spock's a closet masochist. Can't do anything logically. Mister drama king.
Thanks to Nimoy's sickbay aversion, now we got to see him instruct McCoy on brain operation techniques while his brain was half-attached. And they didn't even play it as comedy. I wanted to laugh, but I couldn't.
Plus the remote control click-click-click, natch.